Hot-air engine.



Na. 667,744. Patented Feb. I2, I91.

F. STDLZE.

HUT AIR ENGINE. (Application filed 1m. 93/1898.)

(No Model.)

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PATENT FRANZ STOLZE, OF BERLIN, GERMANY.

HOT-AIR ENGINE.

SPECIFICATION forming part of Letters Eatent No. 667,744, dated February 12, 190] Application filed March 23, 1898.

To (LZZ whom it may concern:

Be it known that l, FRANZ STOLZE, doctor of philosophy, lector on te Friedrich-VVilhelms 'Universitat, acitizen of the Kingdom of Prussia, residing at Eichen-Allee 23, Berlin, West en d, Germany, have invented certain new and useful Improvements in and Relating to Hot Air Engines, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to hot-air motors.

It consists in a hot-air motor of the turbine type having a compression and an expansion cylinder, both concentric to one another upon a common shaft.

It also consists in various improvements in the guide vanes or blades arranged in said cylinders.

It further consists in a furnace or com bustion-chamber for heating the air supplied to it from the compressioncylinder and delivering it to the expansion-cylinder for generating mechanical energy.

The invention further consists in the various details of construction and in the combination and arrangement of the parts thereof, as will now be described.

The accompanying drawings,forming a part of this specificatiomshow, by Way of example, one of the forms my invention may assume.

Figure 1 is a longitudinal section of the motor, showing also a portion of the furnace in its relation to the compression-cylinder. Fig. 2 is a transverse section through the furnace or combustion-chamber, the dotted lines showing its connection with the expansioncylinder. Fig. 3, which is an edge view of the guide-vanes, is a detail of the blades or guide-vanes.

Referring to the drawings, A represents a compression-cylinder, and B an expansioncylinder, mounted concentric to one another upon a hollow shaft O, journaled in bearings D, as shown, and provided with power-pulley C. The furnace is shown at E. The cylinders A B are arranged in a substantially cylindrical housing or casing F, which is open at its end F, where it is provided with an annular flange F The other end is provided with a conduit G for escape of products of com- Serial No. 674,933. (No modela bustion. Thecylindersthemselvesareofconical or tapering form and comprise the peripheral plates a, bolted or otherwise secured to the bent portions 0 of the shaft at c. Said cylinders are united by a central chamber H, flared at its ends 71 h and having centrally thereof a partition 77,. The walls of chamber H and the partition 71, and easing F form two annular passages I and K, the function of which will be discussed later on.

. It will be seen that the compression-cylinder A is of less diameter and length than the expansion-cylinder B, and that between the peripheries of the cylinders and the casing F there are provided annular spacesffor the passage of the fuel medium. From the surface of easing F and the two cylinders pro ject curved guide vanes or blades, (designated, respectively, by L and T.) The relation of these sets of guide-vanes one to the other is clearly shown in Fig. 3.

It will be apparent that as the air enters the apparatus at F it will be compressed, impart-- ing a rotary motion to'the motor and entering the annular passage I, whence it passes to an air-tight furnace E via, inlet I. From here itpasses through a conduit E to the an nular passage K through port is, shown dotted. The hot-air now impinges the guidevanes L in the expansion-cylinder, and its reactionary efiect is concentrated upon the next vane T of shell B, affording a maximum of mechanical energy. It is evident, of course, that I may employ any suitable common means for accelerating the draft or current of air to the compression-cylinder. It will also be apparent that by mounting the compression and expansion cylinders concentric to one another upon a common shaftI obtain the greatest possible results as regards economy of space and fuel and maximum of energy delivered.

While the invention has been described with more or less minuteness, it should in no wise be restricted to the exact construction and details shown, but rather should be limited in scope as indicated in the claim.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

In a hot-air engine, a stationary outer shell consisting of two end sections in line andconcentric with each other, one open at its outer end and the other, at its outer end, communicating with the stack, a central connection portion secured to the inner ends of the sections and connecting them together, a partition in the central portion having a central opening, and vanes on the inner peripheries of the end sections, in combination with a concentric hollow shaft journaled outside the shell and comprising two flared sections entering the ends of the shell and a central section having its opposite ends flared, expansion and compression chambers in line with each other and concentric Within the shell having their outer ends secured to the flared end sections of the shaft and at their inner ends to the flared ends of the central section of the shaft, and vanes on the outer peripheries of the expansion and compression cylinders alternating with the vanes of the shell, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FRANZ sroLzEl YVitn esses:

O. H. DAY, -HENRY I-IASPER. 

